JP3216525B2 - Roll opening zero point adjustment method for section steel rolling mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for adjusting a roll opening zero point of a section steel rolling mill.

[0002]

2. Description of the Related Art As a conventional zero adjustment method in a universal rolling mill having a pair of upper and lower horizontal rolls and a pair of vertical rolls, there is a method disclosed in, for example, JP-A-57-127513. FIG. 8 is an explanatory diagram for explaining a method of adjusting the roll opening zero point of the section steel rolling mill disclosed in the publication. Hereinafter, an outline of the conventional method for adjusting the roll opening zero point of the section steel rolling mill will be described with reference to FIG. First, the lower horizontal roll 1 is moved to the vertical center position of the vertical rolls 3 and 4 (pass line position).
, The upper horizontal roll 2 is automatically tightened, and the reduction motor is stopped when the reduction motor reaches a predetermined current or the rotation speed of the motor becomes lower than the predetermined speed.
After zero adjustment of the horizontal roll in this way, the upper and lower horizontal rolls are separated to obtain a roll gap 12. Next, the vertical rolls 3, 4 on the free side and the drive side are automatically tightened in the same manner as described above, and then released to obtain vertical roll intervals 13, 14, thereby completing the adjustment operation.

[0003]

As a method of making the lower horizontal roll 1 coincide with the pass line position in the above-mentioned prior art, the lower horizontal roll 1 is moved from the lower limit position of the lower horizontal roll 1 to the lower horizontal roll 1.
Was corrected and converted to a position near the pass line position, and the final fine adjustment was visually performed by an operator on the machine side. Therefore, the reference position of the lower horizontal roll 1 may not accurately coincide with the pass line position, and when the H-section steel is rolled in such a state, as shown in FIG.
Web center deviation occurs, which causes dimensional defects.

In the prior art, the method of automatically tightening the upper horizontal roll 2 is based on a method in which the upper horizontal roll pressing motor has a predetermined current or the rotating speed of the motor has become lower than a predetermined speed. Therefore, even if a level difference occurs between the drive side and the free side when the upper horizontal roll is tightened, this cannot be detected. Therefore, when the H-section steel is actually rolled by a rolling mill whose zero point has been adjusted in a state where a level difference has occurred, a dimensional defect in which the distance from the web surface to the flange toe differs between the left and right flanges as shown in FIG. 10 occurs. .

[0005] Further, in the same manner as the upper and lower horizontal rolls 1 and 2, the method of adjusting the roll opening zero point in the edger rolling mill arranged in tandem with either the front or the rear of the universal rolling mill is performed by moving the lower edge roll from its lower limit position. The roll diameter was corrected and converted to the vicinity of the pass line position, and the final fine adjustment was a method in which the operator visually adjusted the position on the machine side. There was a problem.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and it is possible to make quick adjustments and to reduce the rate of occurrence of dimensional defects in a shaped steel. It is an object to provide a degree zero adjustment method.

[0007]

According to the present invention, there is provided a method for adjusting a roll opening zero point of a section steel rolling mill, comprising the steps of automatically detecting the center position of a vertical roll in the vertical direction, and determining the detected center position as a reference position. As a step of adjusting the level of either the upper horizontal roll or the lower horizontal roll to the reference position, and the lower horizontal roll or the upper horizontal roll that has not been level-adjusted in the step, between the drive side and the free side. A step of tightening the upper horizontal roll or the lower horizontal roll with a predetermined load while performing a level adjustment so that a load difference does not appear, and a step of sequentially tightening the pair of vertical rolls with the predetermined load on the horizontal roll,
It is provided with.

Further, the method for adjusting the roll opening zero point of an edger rolling mill or a widening rolling mill according to the present invention comprises the steps of automatically detecting the vertical center position of a vertical roll of a section steel rolling mill; With the position as a reference position, a step of adjusting the level of either the upper roll or the lower roll of the edger rolling machine or the widening rolling mill to the reference position, the lower horizontal roll or the upper horizontal roll that has not been level-adjusted in the step. And tightening the upper horizontal roll or the lower horizontal roll with a predetermined load while adjusting the level so that a load difference does not occur between the drive side and the free side.

Further, the method for adjusting the roll opening zero point of an edger rolling mill or a widening rolling mill according to the present invention includes a step of automatically detecting a vertical center position of a vertical roll of a section steel rolling mill;
Using the detected center position as a reference position, adjusting the level of either the upper horizontal roll or the lower horizontal roll of the section rolling mill to the reference position; and adjusting the level of the upper horizontal roll or the lower horizontal roll. A step of adjusting the level of either the upper roll or the lower roll of the edger rolling machine or the widening rolling mill based on any of the above, and driving the lower horizontal roll or the upper horizontal roll that has not been level-adjusted in the step to drive the lower horizontal roll or the upper horizontal roll. And tightening the upper horizontal roll or the lower horizontal roll with a predetermined load while performing level adjustment so that a load difference does not occur between the free side and the free side.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. FIG. 1 is an explanatory diagram of an embodiment of the present invention,
FIG. 2 is a diagram showing an example of a layout of an H-section steel rolling line of a section steel plant in which a universal rolling mill is installed. First,
The manufacturing process of the H-section steel will be outlined based on FIG. After the material extracted from the heating furnace at a predetermined temperature is rolled by a breakdown mill (BD), three rolls (R1: edge mill E1 / universal mill U1, R2: universal mill U2 / edge mill E2, F) In each universal mill group, reverse rolling is performed a predetermined number of times to produce an H-section steel. When an H-section steel with a constant outer method is manufactured, the widening rolling mill (Y1 / Y2) 300 is set in the R2 mill group.
Into a tandem and roll.

Next, a method for adjusting the roll opening zero point in the universal rolling mills (U1, U2, F) arranged in the H-section steel rolling line as described above will be described with reference to FIG.
In FIG. 1, 1 is a lower horizontal roll, 2 is an upper horizontal roll,
Reference numerals 3 and 4 denote a pair of vertical rolls, and PL denotes a vertical center line of the vertical rolls 3 and 4, which is a pass line. 401
Is a CCD camera installed on the side of the vertical roll 4, which automatically detects the center position of the vertical roll 4 in the vertical direction. As a method of recognizing the center position, as shown in FIG. 1, in the case of a vertical roll having a shape in which the center position in the vertical direction is most protruded, this position is detected, and the center position cannot be recognized only from the shape of the vertical roll. In the case of a roll, the upper and lower ends of the vertical roll are recognized, and the midpoint position is recognized as the vertical center position of the vertical roll.

Reference numerals 101 and 102 denote lower horizontal rolls 1 respectively.
Hydraulic cylinders 103 and 104 for adjusting the positions of the drive side and the free side of the upper horizontal roll 2, respectively.
Is a drive-side load meter that is installed on the drive side of the upper horizontal roll 2 and measures the load applied to the drive side of the upper horizontal roll 2 by the hydraulic cylinder 103; 106 is installed on the free side of the upper horizontal roll 2, Hydraulic cylinder 10
4 is a free-side load cell that measures a load applied to the free side of the upper horizontal roll 2 by the load cell.

A method for adjusting the roll opening zero point using the above-configured apparatus will be described. First, the center position of the vertical roll 4 in the vertical direction is automatically detected by the CCD camera 401, and the detected position is determined as a reference position (P
L: pass line). Next, the lower horizontal roll 1 is set at the reference position PL while adjusting the hydraulic cylinders 101 and 102 so that there is no level difference between the drive side and the free side. Then, the upper horizontal roll 2 is pressed against the lower horizontal roll 1 while adjusting the level with the hydraulic cylinders 103 and 104 so that the difference load signal between the drive-side load cell 105 and the free-side load cell 106 is near 0 ton. Then, the drive-side load cell 105 and the free-side load cell 106
The zero point of the tightening horizontal roll is obtained until the sum load signal of the above becomes a predetermined load, and then the upper and lower horizontal rolls 1 and 2 are separated to obtain the interval 12. Next, the vertical roll 3 on the free side and the vertical roll 4 on the drive side are sequentially tightened to the horizontal roll with a set load, and the vertical roll load on the free side and the vertical roll on the drive side are adjusted to obtain the zero point of the vertical roll. Then, the vertical rolls are separated to obtain the intervals 13, 14, and the zero point adjusting operation is completed.

Embodiment 2 FIG. 3 and 4 are explanatory diagrams of a method of adjusting a roll opening zero point of an edger rolling mill arranged in tandem before and after a universal rolling mill according to a second embodiment of the present invention. First, an apparatus used in the present embodiment will be described with reference to FIGS. In FIG.
Is lower edger roll, 212 is upper edger roll, 20
Reference numerals 1 and 202 denote hydraulic cylinders for adjusting the positions of the lower edge roller 211 on the drive side and the free side, respectively.
Numerals 3 and 204 denote hydraulic cylinders for adjusting the positions of the upper edge roll 212 on the drive side and the free side, respectively.
Is installed on the drive side of the upper edge roll 212,
A drive-side load cell 206 for measuring the load applied to the drive side of the upper edge roll 212 by the hydraulic cylinder 203 is installed on the free side of the upper edge roll 212 to measure the load applied to the free side of the upper edge roll 212 by the hydraulic cylinder 204. It is a free load cell to be measured.

In FIG. 4, 1, 2 and 4 respectively correspond to FIG.
The lower horizontal roll, the upper horizontal roll, and the vertical roll shown in FIG. Reference numerals 211 and 212 denote a lower edge roll and an upper edge roll shown in FIG. 3, respectively. Reference numeral 402 denotes a laser projector installed upstream of the universal rolling mill, and reference numeral 404 denotes a laser receiver installed downstream of the edger rolling mill. The laser projector 402 and the laser receiver 404 are configured so that their positions can be precisely adjusted by so-called silnack cylinders 403 and 405, respectively.

A method for adjusting the roll opening zero point performed by the above-configured apparatus will be described. After completing the zero adjustment work in the universal rolling mill as described in the first embodiment, only the lower horizontal roll 1 of the universal rolling mill is set at the reference position PL, and the upper horizontal roll 2 is opened. . Next, the sineak cylinder 403,
At 405, position adjustment is performed. After this position adjustment, the lower horizontal roll 1 of the universal rolling mill is lowered to a position where the lower horizontal roll 1 does not interfere with the laser beam of the laser projector 402, and the lower edge roll 211 is moved so that there is no level difference between the drive side and the free side. , 202 while making adjustments. Then, the upper surface of the lower edge roll 211 crosses the optical axis of the laser beam, and the lower edge roll 211 is raised until the laser light receiver 404 detects it, and stopped at the same time as the laser light receiver 404 is detected. Set to.

Next, the upper edger roll 212 is moved to the hydraulic cylinders 203 and 20 so that the difference load signal between the drive-side load cell 205 and the free-side load cell 206 is close to 0 ton.
At 4, the user presses the lower edge roll 211 while adjusting the level. The zero point in the upper and lower edge rolls is obtained by tightening until the sum load signal of the drive load cell 205 and the free load cell 206 reaches the set load.
The zero point adjustment operation is completed by obtaining 1, 222 and 223.

In the second embodiment, the roll opening zero point of the edger roll is adjusted with reference to the lower roll of the universal rolling mill whose position has been adjusted with reference to the vertical center position of the vertical roll of the universal rolling mill. However, the present invention is not limited to this. The center position of the vertical roll in the vertical direction may be detected, and the roll opening zero of the edge roll may be adjusted based on the detected value. .

FIGS. 6 and 7 show two types of H-section steel (size: H5).
00 × 200 × 10 × 16, H900 × 300 × 16 ×
28 is a graph of the distribution of the center deviation of the mold material of (28) (see FIG. 5 for the meaning of the center deviation), and shows before and after the introduction of the present invention, respectively. In addition,
In the graph, N indicates the number of samples, X- (X-bar) indicates the average value of the center deviation amount, and σ indicates the standard deviation. As can be seen from the graphs of FIGS. 6 and 7, the standard deviation after the introduction of the present invention is smaller than that before the introduction of the present invention in both cases of the two types of H-section steels. It can be seen that the variation has been reduced. Also,
Since the average value of the center deviation amount is also small, it is clear that the effect of reducing the center deviation of the H-section steel was also obtained.

[0020]

As described above, in the present invention,
The vertical center position of the vertical roll is automatically detected, then the level of one of the upper and lower horizontal rolls is adjusted based on the detected center position, and the lower upper horizontal roll that has not been level-adjusted to the drive side. Since the upper and lower horizontal rolls are tightened with a predetermined load while performing level adjustment so that a load difference does not appear between the free side and the horizontal rolls, and finally the pair of vertical rolls are sequentially tightened with the predetermined load on the horizontal rolls. The adjustment can be performed quickly, and the occurrence rate of dimensional defects of the shaped steel can be reduced.

Further, the zero adjustment of the roll opening of the edger rolling mill or the widening rolling mill is performed by setting the load between the drive side and the free side of the horizontal roll based on the vertical center position of the vertical roll of the section steel rolling mill. Since the tightening is performed with a predetermined load while performing the level adjustment so as not to cause a difference, the adjustment can be performed quickly as described above, and the dimensional defect occurrence rate of the shaped steel can be reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a method for adjusting a roll opening zero point of a universal rolling mill according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of one embodiment of the present invention, and is a diagram showing a configuration of a rolling line of a general shape steel plant.

FIG. 3 is an explanatory diagram of a roll opening zero adjustment method for an edger rolling mill according to another embodiment of the present invention.

FIG. 4 is an explanatory view of another embodiment of the present invention shown in FIG. 3, showing a configuration of an arrangement of a universal rolling mill and an edger rolling mill.

FIG. 5 is an explanatory diagram for explaining the deviation of the center of the H-section steel.

FIG. 6 is a graph showing an example of a result of implementing the present invention.

FIG. 7 is a graph showing an example of a result of implementing the present invention.

FIG. 8 is an explanatory view of a conventional method for adjusting a roll opening zero point of an H-beam rolling mill.

FIG. 9 is an example of a dimensional defect due to center deviation generated when rolling is performed by a rolling mill adjusted by a conventional roll opening zero adjustment method.

FIG. 10 is another example of a dimensional defect due to center deviation generated when rolling is performed by a rolling mill adjusted by a conventional roll opening zero adjustment method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower horizontal roll 2 Upper horizontal roll 3 Free side vertical roll 4 Drive side vertical roll 101,102,103,104 Hydraulic cylinder 105,106 Load cell 201 Hydraulic cylinder 201,202,203,204 Hydraulic cylinder 205,206 Load cell 211 Lower edger roll 212 Upper edger roll 300 Widening rolling mill 401 CCD camera 402 Laser projector 404 Laser receiver

Continuation of the front page (72) Inventor Tatsuro Udagawa 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Co., Ltd. (58) Field surveyed (Int. Cl. ⁷ , DB name) B21B 37/00-37 / 78

Claims (3)

(57) [Claims] 1. A method for automatically adjusting a zero position of a vertical roll of a shape rolling mill having a pair of upper and lower horizontal rolls and a pair of vertical rolls, the method comprising: automatically detecting a vertical center position of the vertical roll; Using the position as a reference position to adjust the level of either the upper horizontal roll or the lower horizontal roll to the reference position, and transferring the lower horizontal roll or the upper horizontal roll that has not been level-adjusted in the process to the drive side and the free side A step of tightening the upper horizontal roll or the lower horizontal roll with a predetermined load while performing a level adjustment so that a load difference does not appear, and a step of sequentially tightening the pair of vertical rolls to the horizontal roll with a predetermined load, A method for adjusting a roll opening zero point of a section steel rolling mill, comprising: 2. A method for adjusting a roll opening zero of an edger rolling machine or a widening rolling mill arranged in tandem before and after a shape rolling mill having a pair of upper and lower horizontal rolls and a pair of vertical rolls, Automatically detecting the center position of the vertical roll in the vertical direction; and adjusting the level of either the upper roll or the lower roll of the edger rolling machine or the widening rolling mill to the reference position using the detected center position as a reference position. And adjusting the level of the lower horizontal roll or upper horizontal roll that has not been level-adjusted in the step so that a load difference does not appear between the drive side and the free side. A method of adjusting a roll opening zero point of an edger rolling machine or a widening rolling mill, comprising a step of tightening a roll with a predetermined load. 3. A method for adjusting a roll opening zero point of an edger rolling machine or a widening rolling mill arranged in tandem before and after a shape rolling mill comprising a pair of upper and lower horizontal rolls and a pair of vertical rolls, Automatically detecting the center position of the vertical roll in the vertical direction; and adjusting the level of either the upper horizontal roll or the lower horizontal roll of the section steel mill to the reference position using the detected center position as a reference position. And adjusting the level of either the upper roll or the lower roll of the edger rolling machine or the widening rolling mill based on either the upper horizontal roll or the lower horizontal roll whose level has been adjusted. For the lower horizontal roll or upper horizontal roll that was not adjusted, the upper horizontal roll or the upper horizontal roll while performing level adjustment so that a load difference does not appear between the drive side and the free side. Edger rolling mill or widening rolling mill roll opening zero point adjustment method characterized by comprising the a step of tightening a predetermined load in the horizontal rolls.